Power-head for deep-well pumps.



R. F. MULLER.

POWER HEAD FOR DEEP WELL PUMPS.

APPLICATION FILED APR.19,1911.

Patented Jan. 21, 1913.

2 SHEETS-SHEET 1.

R. P.-MULLER.

POWER HEAD-FOR DEEP WELL PUMPS.

APPLICATION FILED APR.19,1911.

Patented Jan. 21, 1913.

2 SHEETSSHEET 2v n mum in lnmnm lunar RUDOLPH FR. MULLER, OF BERKELEY, CALIFORNIA, ASSIGNOR TO BYRON JACKSON IRON WORKS, 0F BERKELEY, CALIFORNIA, A CORPORATION OF CALIFORNIA.

POWER-HEAD FOR DEEP-WELL PUMPS.

LOfiL dt.

To all whom it may concern:

Be it known that I, RUDOLPH FRITZ MUL- LER, a subject of the Emperor of Germany, residing at Berkeley, in the county of Alameda and State of California, have invented new and useful Improvements in Power- Heads for Deep-Well Pumps, of which the following is a specification.

This invention relates to pumps, and particularly pertains to a mechanism for oper ating same by means of which a constant uniform rotary motion is converted into a variant reciprocating motion, so as to obtain diiferent speeds at different positions of the stroke of the pump piston.

The invention is particularly applicable for deep wells.

It is the object of this invention to provide a mechanism of the above character by means of which a reciprocating pump piston may be caused to travel at a low speed on the up or lifting stroke and at a high speed on the down or charging stroke.

A further object is to so construct and arrange the operating mechanism or driving portion of my invention that it may be employed to actuate simultaneously a plurality of pistons in a single pump cylinder in opposite directions and at different speeds in relation to each other, and by the use of which a constant and nearly uniform flow of fluid from the pump cylinder will be obtained for running at as high speed as pos sible and working without shock or jar.

The invention consists of the parts and the combination and construction of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which- Figure 1 is an end elevation of the invention with parts broken away. Fig. 2 is a section on the line to w, Fig. 1, partly in elevation. Fig. 3 is a detail section on the line a; as, Fi 2. Fig. 4 is a detail section on the line 3 y, Fig. 2. Fig. 5 is a detail elevation of the transmission gear showing the variable crank as positioned intermediate the upward stroke. Fig. 6 is a similar view showing the variable crank in its uppermost position. Fig. 7 is a longitudinal section through the variable crank mechanism. Fig. 8 is a similar view showing the crank on the side opposite that shown in Fig. 7. Fig. 9 is a vertical section of the pump casing showing the pair of pump pistons in ele- Specification of Letters Patent.

Application filed April 19, 1911.

Patented Jan. 21, 1913.

Serial No. 622,043.

vation. Fig. 10 is a diagram illustrating the movements of the transmission mechanism.

In the drawings A represents a pump cylinder of any suitable description in which a pair of superposed pump pistons 2 and 8 are slidably mounted. These pistons 23 are provided with valves 1 of any suitable type, here shown as flap valves, which are designed to open and close ports communicating with the upper and lower sides of the pistons in the well known manner common in pump construction. The uppermost piston 2 is mounted on the lower end of a tubular piston rod and the lower piston 3 is mounted on the lower end of a piston rod 6 which extends upward through the inside of the tubular piston rod 5 and is reciprocal therein. The upper end of the piston rod 5 has a cross head 7 mounted thereon, which cross head is perforated at its ends to receive the lower ends of a pair of connecting rods 8.

The connecting rods 8 extend through the perforations in the cross head 7 and are slidable therein in event downward movement of the rod 5 is prevented; nuts 9 being threaded on the lower end of the rods 8 below the cross head 7 so that the cross head 7 and the rod 5 will be caused to travel with the connecting rods 8 as the latter are moved in an upward direction. When the connecting rods are at rest or are moved downward, the cross head 7 will normally be supported on the nuts 9 by reason of the weight of the piston rod 5. The upper ends of the con necting rods 8 have yokes 10 mounted thereon, which yokes are pivotally connected to the outer ends of a pair of parallel walking beams 11. The beams 11 are both pivotally connected to the lower end of a pitman 12 and are fulcruined at their outer ends on swinging links 13 mounted on a frame 14, disposed above the upper end of the well casing A. Connected to each of the beams 11 is a radius link 15 mounted on a hanger 16, which links are attached to the beams intermediate the fulcrum point and the point of connection with the pitman 12.

The upper end of the pitman 12 has a head formed thereon which is pivotally connected to a wrist-pin 17 on a lever 18. This lever 18 is mounted in and slidable on a guide plate 19, flanges being formed on the outer face of the guide plate which contacts the longitudinal edges of the lever 18 and form guides therefor.

The guide plate 19 is rigidly mounted on a gudgeon or fulcrum 20 which is revoluble in a fixed bearing 21 mounted on the frame 14; a collar 22 being mounted on the inner end of the gudgeon 21 to retain it in posi tion in the bearing 21. The outer end of the gudgeon 21 extends into and is secured to a hub 23 formed on the guide plate 19 which hub projects through a slot formed in the lever 18 lengthwise thereof. A hub 24: is formed on the lever 18 on the end opposite that on which the wrist-pin 17 is mounted. This hub 24: surrounds a pin 25 which extends through a longitudinally disposed slot 26 formed in the guide plate 19 and is rigidly and eccentrically mounted on a gear wheel 27 The gear wheel 27 is revolubly mounted about a hub formed on the bearing 21 eccentric to the axis of rotation of the gudgeon 20, and is designed to be constantly rotated by means of a pinion 28 on a drive shaft 29 driven in any suitable manner.

From the foregoing it will be seen that, when the gear wheel 27 is rotated, the guide plate 19 and the lever 18 thereon (which parts 1918 together form a crank element of variable throw) will rotate in unison with a gear 27, about the eccentric axis 20 by reason of the pin 25; the slot 26 in the plate 19 permitting of the shifting of the plate lengthwise with respect to the pin 25.

Thus by reference to Figs. 56 and 10, it is seen that the guide plate 19 and the sliding member 18 form together a telescoping link or lever which has for its fulcrum the gudgeon 20 eccentric to the gear 27, with one end of the link or lever carry ing the wrist-pin l7 and the other end of the lever pivoted by pin 25 to gear 27, the rods 5 and 6 move upward slowly and then lower more rapidly; the upward movement being represented by the short leverage at the left of Fig. 10, and the downward movement by the longer leverage at the right; the gear wheel 27 always revolving at the same rate of speed.

As illustrated in diagram in Fig. 10, a is the center of rotation of the gear 27, and also the center of the arc Z2, which represents the path of travel of the pin 25 and approximately the arc of the wrist-pin 17; 20 is the gudgeon on which lever 18 fulcrums. Referring to the diagram in Fig. 10, let it be assumed that the pin 25 on the gear 27 is positioned at 0 and the wristpin 17 at d and both traveling approx-i9 mately on the line 5 around the center a in the direction indicated by the arrow 6. Now as the pin 25 moves upward on an arc of a circle to a point f, for example, the wrist-pin 17 will move downward to the point g, also on an arc of a nearly circular curve. The lever 18, carrying the pins 25 and 17 being pivoted to and shiftable on the eccentrically positioned stationary fulcrum 20, is caused to travel in such direction that it will be constantly positioned in radial relation to the fulcrum 20. From this it will be seen that while the pin 25 is on one side of the fulcrum 20, it will travel a much shorter distance than that traversed by the wrist-pin 17 on the opposite side of the fulcrum 20, and vice versa; both pins, however, traversing their respective distances of travel in the same length of time.

From the foregoing it will be seen that the wrist-pin 17 will be caused to travel at a comparatively high rate of speed on its downward movement but will move upwardly at a slow rate of speed. It will also be observed that by reason of the power by which the wrist-pin is caused to move being delivered thereto on the principle of the lever, it will exert greater power on its up-stroke than it will on the down-stroke, the pin 25 constantly rocking the link or lever 18 on its fulcrum 20 as it revolves with the gear 27. It follows, that when the gear 27 is revolved, and the wristpin 17 is caused to travel, as described, that the piston rod 5 and the piston 2 will be moved upward on the lifting stroke at a slow rate of speed and will be permitted to gravitate.

downward at a high rate of speed.

Intermeshing with the gear 27 is a like gear 27, which is mounted in the same manner as the gear 27 and has a pin 25, thereon, this pin 25, connecting with a block 18 slidable 011 a guide plate 19 mounted on a gudgeon 20. The block 18 has a wrist-pin 17 mounted thereon, which pin is connected to a connecting rod 12 leading to a walking beam 11 fulcrumed on a link 13 and attached to a radius link 15'. The gear 27 and the parts connected thereto and just enumerated, correspond to the gear 27 and the parts mounted thereon and previously described; the parts operated on by the gear 27, however, being disposed and arranged opposite those on the gear 27 so as not to nfiict therewith.

The inner end of the walking beam 11 is pivotally connected to a cross head 7 through which the upper end of the piston rod 6 extends; the rod 6 being slidable in the cross head 7 to admit of a downward movement of the latter in relation thereto and having nuts 9 on its upper end by which the rod 6 is engaged by the cross head. 7 so that the rod 6 will be moved upward in unison therewith, as the cross head is reciprocated by walking beam 11.

The walking beams 1111 are so disposed in relation to each other that when the piston 2 is nearly in its uppermost position on the upstroke, lower piston 3 will be at its lower-most position and ready to move on its up-stroke so that the moment the piston 2 starts on its downstroke, it will move toward the piston 3 as the latter travels on its tip-stroke, the two pistons practically meeting a moment before the lower piston completes its upward movement. By this arrangement both pistons 2 and 3 will be moving in the same direction at the moment of nearing the ends of their strokes but will travel in opposite directions between the stroke terminations. That is to say, while the piston 2 is moving on its upward or lift stroke at a slow speed, with the valve l closed and carrying a volume of fluid therewith, the piston 3 will be moving downward at a high speed with its valves open, the piston 3 reaching the limit of its downward movement before the piston 2 completes its upward movement. The piston 3 will then start on its upward movement, and at that moment when its velocity surpasses that of the still upward moving upper piston 2: that is to say, when the volume of fluid between both pistons is going to be compressed,the lower piston 3 closes its valves 4 and takes up the fluid. It is important to mention that the load of fluid is not taken up by the piston in its lowest position, as in this case the flow of fluid would stop, causing great shocks. The upper piston 2 on reaching the limit of its upward movement will be quickly returned to its lowermost position through the volume of fluid being carried upward by the lower piston 3 and will take up the fluid carried by the piston 3 before the latter starts on its downward stroke; at that moment when its velocity surpasses that of the lower piston 3, that is to say, when the space between both pistons is going to increase causing a vacuum in' it. From this it will be seen that a continuous and nearly uniform flow of fluid will be discharged from the upper end of the pump casing A.

In case of sand troubles at the pistons of a deep well pump, it frequently occurs that the rods are collapsed on the down-stroke. To avoid this, the connections of the rods 6 and 8 with their respective beams are automatically released in such cases by means of the loose collars 77, Figs. 3 f, and stops 99 on the rods, so that on the down stroke the collar 7 may slide down rod 6 and the rods 8 slide down through cross-head 7 and by this no compression can be imparted to the pump rods by the downward walking beams 1111'.

The stops provided by the nut 9 on the upper end of rod 6, and of the nuts 9 on the lower ends of rods 8, Fig. 4, are of sufficient strength ordinarily to sustain their normal load, but are of less strength than any portion of the sucker rods 6-5 below in the well, so that these weakened portions outside the well will give way in the event of any extraordinary tension on the up-stroke, thereby saving time in replacing parts or recovering them from the well, in case of a break-down.

The base of the power-head is large. The height of the power-head is small. The cen ter of gravity obtained in the above construction is very close down to the base plate making the construction stable and such that it will work without vibration. The arrangement of the driving devices is such that it affords space enough in the center of the head to allow of the withdrawal of all of the pumps parts from the well, without moving the base plate or other heavy parts of the head from the foundation. The operation of withdrawal merely requires the disconnecting of the pump rod 6 from the crosshead 7, of the rod 8 from the cross-head 7 and of the radius links 15 and 15 from the beams 1l1l, respectively, and is accomplished by outward pulling of the beams at their swinging links 13 and 13.

Having thus described my invention what I claim and desire to secure by Letters Patent is 1. In a power pump head, the combination of a rotary member having a crank element varying in length during each revolution of the rotary member, a walking beam having a shifting fulcrum, a pitman connecting the crank element and walking beam, and a vertically guided pump rod direct-connected with the walking beam.

2. In a power pump head, the combination with a rotary member having a crank element varying in length during each revolution of the rotary member, said crank element consisting of a plate being connected to the rotary member and having a fulcrum eccentric to the rotary member, and a sliding part on the plate also connected with the rotary member and reciprocable in guides on the plate when the rotary member revolves, a walking beam, connections between said sliding part and walking beam to operate the latter, and a pump rod connected with the walking beam.

3. In a power pump head, the combination of a main frame having a central opening with side journal boxes, four gears ar ranged in pairs, each journaled by its supporting spindle in the respective boxes, each pin on its own center line and supported on the frame in such a manner as to form an open space between the faces of the spindles upon which the gears revolve, means for revolving the gears in unison, each of said gears carrying on its inner side an eccentric wrist pin, a lengthwise expansible and contractible crank element connected with each wrist pin and having a fulcrum eccentric to its respective gear, a walking beam for each gear mounted on a shiftable fulcrum, connections between each crank element and the respective walking beam, and a pair of telescoping plunger rods, one of which is connected with one pair of the walking beams and the other of which is connected with the other pair of walking beams.

4. In a power pump head, the combination of a main frame having a central opening with side journal boxes, four gears arranged in pairs, each journaled by its sup porting spindle in the respective boxes, each pin on its own center line and supported on the frame in such a manner as to form an open space between the faces of the spindles upon which the gears revolve, means for revolving the gears in unison, each of said gears carrying on its inner side an eccentric wrist pin, a lengthwise expansible and contractible crank element connected with each wrist pin and having a fulcrum eccentric to its respective gear, a walking beam for each gear mounted on a shiftable fulcrum, connections between each crank element and the respective walking beam, a pair of telescoping plunger rods, each piston rod having a crosshead, and a pair of the connecting rods connecting one crosshead with one pair of walking beams, and another pair of connecting rods connecting the other pair of walking beams, said several connecting rods extending through perforations in their respective crossheads and free to slide through the crossheads on the down stroke of the walking beams, but having stops to engage the underside of the crossheads and positively lift the latter on the upstroke of the walking beam.

5. The translation of rotary motion of constant speed into reciprocating motion of variable speed, by the combination of a rotary member, a walking beam, a rod to be reciprocated connected with the beam, and connections between the rotary member and beam, constructed and arranged to rock the beam in one direction faster than in the opposite direction, said last named connections including a link pivoted at one end to the rotary member and eccentric thereof, the other end of the link connected to the beam, and a fixed fulcrum for the link between its ends and independent of and eccentric tothe rotary member.

6. A pumping mechanism comprising a gear wheel, a wrist-pin thereon, a block pivotally connected at its inner end to said pin, a wrist-pin on the outer end of said block, and a guide plate on which said block is mounted, said plate revolubly mounted eccentric to the axis of rotation of the gear wheel.

7. A pumping mechanism comprising a gear wheel, a wrist-pin thereon, a block pivotally connected atfiits inneifi iend to said pin, a wrist-pin on" the outer end of said block, a guide plate on which said block is mounted, said plate revolubly mounted eccentric to the axis of rotation of the gear wheel, a connecting rod on said last named wrist-pin, a walking beam fulcrumed at one end on a link and pivotally connected to said connecting rod, and a piston rod connected to said walking beam.

8. A pumping mechanism comprising in combination, a pair of intermeshing gear wheels, a wrist-pin on each of said wheels, a block pivotally connected to each of said pins, revoluble guide plates on which said blocks are mounted, said guide plates mounted eccentric to the centers of rotation of the gear wheels, a wrist-pin on the outer end of each of said blocks, a connecting rod on each of said last-named wrist-pins, a pair of walking beams connected tosaid rods, and a pump piston attached to each of said beams.

9. A pumping mechanism comprising in combination, a pair of intermeshing gear wheels, a wrist-pin on each of said wheels, a. block pivotally connected to each of said pins, revoluble guide plates on which said blocks are mounted, said guide plates mounted eccentric to the centers of rotation of the gear wheel, a wristpin on the outer end of each of said blocks, a connecting rod on each of said last-named wristpins, a pair of walking beams connected to said rods, and a pump piston attached to each of said beams, one of said piston rods extending lengthwise through the other and slidable therein, said rocking beams so disposed as to operate said piston rods in opposite directions.

10. In a pump, the combination of a rotary member, an oscillating beam, a crank on the rotary member connected with the beam, and means by which the crank-throw varies in length during each revolution, a pump rod, a sleeve member carried by the beam through which the rod is loosely movable, stop means on the rod co-acting with the sleeve to cause the rod to be lifted on the up-stroke of the beam, means for retaining the rod in vertical alinement, and a shiftable fulcrum for the beam to accommodate the latter to the locus of movement of the pump rod.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

RUDOLPH FR. MULLER.

Vitnesses:

A. G. PAULSMEIER, W. L. FORWARD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0.? 

